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a477f8a61e
an "orphan" has been modified to more closely match the behavior as that of persistent objects, which is that the object is expunged from the :class:`.Session` as soon as it is de-associated from any of its orphan-enabled parents. Previously, the pending object would be expunged only if de-associated from all of its orphan-enabled parents. The new flag ``legacy_is_orphan`` is added to :func:`.orm.mapper` which re-establishes the legacy behavior. [ticket:2655]